Am I forever banned from Twitch?

As far as I know, I haven't received a warning

I admit I offended someone but I'm gone forever now and why not just chat

Looks like Perma Ban but can be fooled.

https://www.blogseite.com/twitch-account-gesperrt-was-tun/

It is not absolutely necessary to receive an advance warning for a ban. Write to the support and maybe leave it at a 1 week lock.